and he has been identified a dzhokhar tsarnaev. that is who they arelookin for, going door to door to find the man believed his brother, the other suspect, we learned he was killed overnight and this happened after a university officer at m.i.t. was shot and killed. the suspect then led police on a man hunt, a car chase, and this was gunfire. they were throwing things out of the car, explosives and that is when an officer was critically injured and the brother was shot and killed. now, police are now looking for the other suspect and they are keeping everyone on lockdown telling people not to on the door for anyone unless they are identified as a police officer. this began after a photo was released by the f.b.i. of the two bombing suspects, surveillance video that came from the day of the marathon showing the two men walking through the crowd. they had backpacks on and they told everyone we need the public's help finding the two men the again, a man has been killed overnight but they are still looking for the second suspect. i am